just got a 2007 2500hd 6.0L w/ 4l80e and when im WOT in second gear around 3800-4000 rpms seems to slip for a few seconds then keeps going. is this normal or is the tranny slipping? the truck keeps acelerating but it seems to hesitate around 4000 rpm then revs out like normal. anyone experience the same thing?

 

Take it back and tell the stealership...
Did you check the fluid? I know its a new truck and all, but you never know....